However, Since r may be too small, we'd better add a limitation on the final return force
2. Attraction: use K△X
3. Gravity: Use mg
4. On calculating the component of the force:
use θ = arctan(△Y / △X ) F_x = Fcosθ , F_y = Fsinθ
remember to deal with △X = 0
Algorithm: follow wikipedia
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